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Debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 01, 2021
Dec. 31, 2020
May 21, 2020
Apr. 24, 2020
Apr. 06, 2020
Debt Instrument [Line Items]            
Other $ (11)   $ (12)      
Long-term debt 4,286   5,075      
Less: amount due within one year 14   376      
Total long-term debt 4,272   $ 4,699      
5.400% Notes, due 2021            
Debt Instrument [Line Items]            
Long-term debt, interest rate     5.40%     5.40%
Amount outstanding 0   $ 361      
5.870% Notes, due 2022            
Debt Instrument [Line Items]            
Long-term debt, interest rate     5.87% 5.87%    
Amount outstanding $ 0   $ 476      
5.125% Notes, due 2024            
Debt Instrument [Line Items]            
Long-term debt, interest rate 5.125%          
Amount outstanding $ 1,197   1,250      
6.875% Notes, due 2025            
Debt Instrument [Line Items]            
Long-term debt, interest rate 6.875%       6.875%  
Amount outstanding $ 600   1,200      
5.900% Notes, due 2027            
Debt Instrument [Line Items]            
Long-term debt, interest rate 5.90%          
Amount outstanding $ 625   625      
6.750% Bonds, due 2028            
Debt Instrument [Line Items]            
Long-term debt, interest rate 6.75%          
Amount outstanding $ 300   300      
3.000% Notes, due 2029            
Debt Instrument [Line Items]            
Long-term debt, interest rate 3.00% 3.00%        
Amount outstanding $ 700   0      
5.950% Notes, due 2037            
Debt Instrument [Line Items]            
Long-term debt, interest rate 5.95%          
Amount outstanding $ 625   625      
4.750% Iowa Finance Authority Loan, due 2042            
Debt Instrument [Line Items]            
Long-term debt, interest rate 4.75%          
Amount outstanding $ 250   $ 250